Item-based commissions with large # of products?

Folks,

I'm setting up a commission schedule that's categorized by items. Some items are included in a high commission schedule, and other less profitable ones need to be in a lower commission schedule.

I know it's possible to add individual items to a commission schedule in this scenario, and it works as expected. Problem is, I have hundreds of these items and they're constantly changing as we modify our product portfolio. Each time we add a new high-margin product someone will need to remember to add it to the higher commission plan(s), and I can see this getting neglected/forgotten and schedules going stale.